Using the Earth's resources and obtaining potable water key terms

aerobic biological treatment

A process that uses microorganisms to break down organic matter in effluent in the presence of oxygen.

effluent

In Waste water treatment, effluent means liquid waste or sewage that is discharged into a river or the sea after treatment. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to describe aerobic biological treatment of effluent. Use effluent only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

potable water

In Waste water treatment, potable water means water that is safe to drink. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to compare the relative ease of obtaining potable water from waste water, ground water and salt water. Use potable water only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

waste water

Water that has been used and contains contaminants, requiring treatment before release into the environment.

waste water

Water that has been used and contains contaminants, requiring treatment before release into the environment.

treatment

The process of removing contaminants from waste water to make it safe for discharge into the environment.

waste water treatment

The process of treating sewage and industrial waste water to remove contaminants before releasing it into the environment.

sewage

Waste water that contains organic matter and harmful microbes, requiring treatment to prevent environmental pollution.

metal ores

In Alternative methods of extracting metals, metal ores means naturally occurring solid materials from which metals can be extracted. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to explain that metal ores are limited resources. Use metal ores only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

limited resources

Resources that are finite in quantity and cannot be replenished within a human timescale.

high-grade copper ores

Copper ores that contain a high percentage of copper, making them economically viable for extraction.

copper extraction methods

Techniques used to obtain copper from its ores, which may include traditional mining and newer methods like phytomining and bioleaching.

phytomining

In Alternative methods of extracting metals, phytomining means a method of extracting metal compounds from soil using plants. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to describe phytomining as using plants to absorb metal compounds from soil. (HT only). Use phytomining only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

metal compounds

metal compounds is a Alternative methods of extracting metals term used to support the objective: Describe phytomining as using plants to absorb metal compounds from soil. (HT only). In Using the Earth's resources and obtaining potable water, use it with the correct resource, water-treatment, LCA, material, Haber process, fertiliser, or sustainability context rather than as a generic repeated keyword.

phytomining

In Alternative methods of extracting metals, phytomining means a method of extracting metals from soil using plants that absorb metal compounds. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to explain how harvested plants are burned to produce ash containing metal compounds. (HT only). Use phytomining only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

bioleaching

In Alternative methods of extracting metals, bioleaching means a process that uses bacteria to produce leachate solutions containing metal compounds. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to explain how harvested plants are burned to produce ash containing metal compounds. (HT only). Use bioleaching only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

bioleaching

A process that uses bacteria to extract metal compounds from ores, producing leachate solutions.

leachate

A solution that contains dissolved metal compounds produced during the bioleaching process.

displacement reaction

A chemical reaction where a more reactive element displaces a less reactive element from a compound.

scrap iron

Iron that is recycled and used as a reducing agent in the extraction of copper from its compounds.

Electrolysis

A process that uses electricity to break down compounds into their elements or simpler compounds.

Copper compounds

Chemical substances that contain copper, which can be processed to extract copper through methods like electrolysis.

phytomining

A method of extracting metal compounds from soil using plants that absorb these compounds.

bioleaching

A process that uses bacteria to produce leachate solutions containing metal compounds for extraction.

biological methods

In Alternative methods of extracting metals, biological methods means techniques that utilize living organisms to extract metals from ores or waste. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to evaluate biological methods of metal extraction from information provided. (HT only). Use biological methods only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

metal extraction

In Alternative methods of extracting metals, metal extraction means the process of obtaining metals from their ores or compounds. This matters in Using the Earth's resources and obtaining potable water because it supports the learning objective to evaluate biological methods of metal extraction from information provided. (HT only). Use metal extraction only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

low-grade ore

An ore that contains a lower concentration of the desired metal, making extraction more challenging.

reduction with carbon

A chemical process where carbon is used to remove oxygen from metal oxides to obtain the pure metal.